VISTEC visbreaker technology program
Achieve the right balance
Our VisTec™ visbreaker technology program controls fouling and maximizes both conversion rate and unit run length, while maintaining heavy fuel oil quality. The program uses proprietary analysis and monitoring techniques to measure vistar stability and fouling tendencies together with a range of chemical additives that interrupt and control fouling, reduce sediment generation, and increase vistar stability when visbreaking severity is increased. Our additives help you expand the operating envelope, while modeling and monitoring enable your refiners to operate the visbreaker at the optimum severity within the expanded envelope, maximizing performance.
Our proprietary analysis techniques determine feedstock characteristics, monitor operational parameters, and predict fouling tendencies. The patented VisTec Coking Index (VCI) measures the physical characteristics of coke in the vistar and calculates the fouling tendencies of the unit. Our VisTec Stability Index (VSI) calculates the stability of the vistar and heavy fuel oil.
Our VisTec additives alter the chemical behavior of the visbreaker feed as it is processed and relax the natural constraints imposed by the feed, debottlenecking process limits and heavy fuel oil specification limits for sediments.
Information from our analytical techniques and simulation algorithms is used within proprietary models to optimize unit operation and maximize conversion without affecting run length.
- Steam optimization modeling determines optimal steam velocity to increase run length and optimize conversion
- Proprietary feed characterization modeling predicts the maximum operating severity and the corresponding conversion
- Skin temperature modeling uses actual skin temperatures and process conditions to measure coke deposition rates, predict run lengths, and model the impact of process conditions on skin temperature
- Continuous VSI and VCI monitoring of vistar stability and coke generation corrects operating severity to control fouling and keep the unit running within the optimal range to achieve maximum conversion
- Our patented asphaltenes fractionation method routinely measures barely soluble asphaltenes in the vistar to predict the impact of conversion increase on fouling